I've actually recently done the math for shadow showing what pieces give the largest stat/dps gain. I think it is safe to assume that healing priests would receive the same amount of throughput gain from the pieces in order.

No matter how you shape or form this, Relic of Chi'ji, even without upgrades, is superior to normal Spirits of the Sun. Unless all you care about is iLvL ofcourse.

And the other raiding trinkets dont even come close.

---------- Post added 2012-11-30 at 11:54 PM ----------

Originally Posted by Docta

Can't decide if its worth upgrading, access to tsulong normal/hc will trinkets... I do love spirit procs for rapture though

Granted Rapture is based on actual spirit, having a trinket with a higher ICD thus higher spirit value might in the long run actually result in a higher mana return, i dont know. The fact remains that upgraded Relic of Chi'ji is amazingly good.